Looking back, looking ahead at four topics related to Saturday's 43-34 victory over Western Michigan and this week's matchup against Central Michigan:

FIRST DOWN

The end result was a balanced attack: 39 rushes, 38 passes by Purdue's offense.

However, the Boilermakers were pass happy in the first half and run heavy in the second. Which was the most productive? The run game was consistent in both halves, which allowed the passing attack to be more efficient after halftime.

Quarterback Danny Etling attempted 30 passes in the first half, completing just 13. In the second half, though, Etling was 6 of 8 and that is a direct result of the success on the ground.

Etling wasn't sharp, completing just 50 percent. Drops and receivers not getting off coverage didn't help, but Etling will be the first to admit he was off the mark.

But the sophomore did deliver when it counted. He finished 9 of 14 on third down after starting 1 of 5. Here's something to digest: Etling was 7 of 7 on third down during four scoring drives, leading to 20 points.

THIRD DOWN

Among the statistics that improved from last year was punt return yardage.

In 12 games last season, Purdue totaled 104 return yards. Thanks to Frankie Williams, the Boilermakers already have 63 yards. Both returns led to points, and that is the most important number to note.

FOURTH DOWN

Based on returning starters, Central Michigan is the most experienced team in the Mid-American Conference. The Chippewas return 20 starters, including 10 on offense and two on special teams.

Despite all of those veterans, Central Michigan trailed Chattanooga, an FCS program, 16-0 before winning 20-16 in its opener Thursday. The Chippewas took advantage of four interceptions and Michigan transfer Thomas Rawls rushed for 123 yards on 25 carries.